Khan Academy Digital Information Test
UPDATED ACTUAL Questions and
CORRECT Answers
Eino is composing a short film about climate change which he plans to display at a science
museum and on his public YouTube channel.
He searches a video streaming website and finds a video clip with a time lapse of melting ice
caps that would be perfect for the film.
Assuming US copyright laws, is Eino allowed to use the video clip for his film? - CORRECT
ANSWER✔✔- He can use the video clip if it is explicitly licensed for re-use, like with a
Creative Commons license, and he follows the conditions of that license.
GIMP is an open source photo editing application that gives you a variety of ways to
manipulate photos.
Categorize each operation as either "lossless" or "lossy": - CORRECT ANSWER✔✔- Crop:
Trims the sides of the image. - LOSSY
Grayscale: Converts the photo to black & white (256 shades of grey). - LOSSY
Invert: Inverts all the pixel colors and brightness values (i.e. black pixels become white
pixels). - LOSSLESS
Consider this sequence of bits:
101111111101000111111101
How many bytes long is that sequence of bits? - CORRECT ANSWER✔✔- 3
What is true about the process of converting analog data into digital data? - CORRECT
ANSWER✔✔- The digital version is a representation of the analog data but cannot include
all of the details.
Modern car dashboards contain a number of visual indicators to help drivers be safer, more
responsible drivers.
Which of these indicators could be represented by a single bit? - CORRECT ANSWER✔✔- -
The warning icon that indicates a seat belt isn't fastened
- The "ECO" label that indicates the car is in fuel efficiency mode (versus standard fuel
mode)
, You're visiting a Computer Science building at a college, and they've decided it'd be fun to
display all the room numbers in binary. You're going to room 13.
What binary number should you look for on the door of room 13?
Type the binary number without any spaces: - CORRECT ANSWER✔✔- 1101
Run-length encoding (RLE) is a data compression technique that replaces "runs" (sequences
of bits with the same value) with a number representing the length of the run.
RLE can be used to compress color images, especially when the colors are from a limited
palette.
The following is a run-length encoding of an 8x8 icon with 3 colors. "R" signifies a red run,
"G" signifies a green run, and "Y" signifies a yellow run.
3Y,2R,3Y 2Y,1R,2G,1R,2Y 1Y,1R,4G,1R,1Y 1R,6G,1R 1R,6G,1R 1Y,1R,4G,1R,1Y
2Y,1R,2G,1R,2Y 3Y,2R,3Y
What does this icon look like? - CORRECT ANSWER✔✔- A diamond
A cryptocurrency decides to use 6-bit hexadecimal numbers to refer to each block in their
blockchain. The first block is 000000, the second block is 000001, etc.
Which of these lists correctly sort block numbers from lowest to highest?
03CE1B, 0A8FE3, 742EE8, 8FD758, 935041, BF0402 - CORRECT ANSWER✔✔-
03CE1B, 0A8FE3, 742EE8, 8FD758, 935041, BF0402
In the classic arcade game Donkey Kong, the code calculates the time allowed per level by
multiplying the current level by 10 and adding 40. On level 22, that calculated time is 260.
However, the game displays a time of 4 instead of 260.
It is impossible for anyone to complete the level in just 4 seconds, so no player ever makes it
past level 22.
What is the most likely cause of the level 22 bug? - CORRECT ANSWER✔✔- Integer
overflow error
Tom is recording an album of songs using a digital audio recording application, and he wants
the recordings to be high quality.
Which advice will best help him to achieve his goal? - CORRECT ANSWER✔✔- He should
save the audio using a lossless compression algorithm.
